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Other Long-Term Assets (Tables)
 3 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Long-term Assets
Other long-term assets consisted of the following:
December 31, 2020September 30, 2020
Right of use asset$30,260 $30,999 
Vendor contract assets2,481 2,889 
SERP investment1,282 1,214 
Prepaid unamortized debt issuance cost - revolver494 537 
Other long-term assets4,440 4,368 
Total$38,957 $40,007